METHOD FOR PRODUCING DISCRETE REINFORCED COMPOSITE MATERIAL Russian patent published in 2023 - IPC C08J5/04 C08J5/10 

FIELD: creating composite materials.

SUBSTANCE: invention is related in particular to a method for forming a matrix in a composite material based on a polymer subjected to thermal aging and low-temperature carbonization. The method for producing a discrete reinforced composite material according to the invention includes the following steps: drying the initial components, including an ethylene vinyl acetate polymer, or a butadiene-nitrile rubber elastomer or its mixture with coal tar pitch; functional filler selected from silicon carbide, tungsten carbide, titanium nitride and shungite filler or mixtures thereof with graphite, multi-walled nanotubes and carbon black, and/or reinforcing filler selected from carbon fibres or basalt fibres, and an auxiliary component, which is a crosslinking agent and/or an agent that controls the course of thermal degradation processes, these components are distributed per 100 parts by weight of the polymer or elastomeric matrix at the following ratio of components in the matrix, in parts by weight: functional and/or reinforcing filler – 1-1200, auxiliary component – 0.5-50; subsequent surface treatment of the initial components, including at least one operation selected from desizing, surface activation, whiskerizing, subsizing, chemical cleaning, sizing of fibrous fillers, surface treatment of fillers, including chemical surface treatment using alkalis, acids, organofunctional silanes; obtaining a homogeneous mixture by mixing the initial components; forming a workpiece using moulding or mouldless technology; vulcanization of the workpiece at a temperature of 120-220°C and a pressure of 0.1-10 MPa for 5-60 minutes or heat treatment at temperatures of 170-220°C for 1-12 hours, or radiation exposure with an exposure dose of 1-35 millirad; heat treatment of the workpiece in an inert gas or air environment, including heating the workpiece to a temperature of 280-550°C at a rate of 0.01-10°C/min; cooling the billet to room temperature, while the billet is cooled to a temperature of 80°C at a rate of 0.001-2.5°C/min.

EFFECT: obtained composite materials can replace traditional heat-resistant polymeric materials and composites in the production of units and parts of machines and devices, be used in pumping equipment, for manufacturing parts of friction units, as materials for chemical equipment, in electrode blocks of electrochemical cells, in radiators of electronic devices.

7 cl, 2 dwg, 2 tbl